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Special Session Mine

Past Producer in San Miguel county in Colorado, United States with commodities Gold, Silver, Lead, Copper, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10111404
MRDS ID D010897
MAS/MILS ID 0081130833
Record type Site
Current site name Special Session Mine
Alternate or previous names Patented Claims: Special Session, MS 12908, Slide Rock, MS 12908, Oasis, MS 12908, Polar No. 1, MS 12908, Polar No. 2, MS 12908, Polar No. 3, MS 12908

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -108.01366, 37.868 (WGS84)
Elevation 3901
Location accuracy 100(meters)
Relative position Adit labeled on GQ-536 but vein is almost 5,100 ft. to the SE. Adit is labeled "Mine" on topo. 11.9 MILES S 62 W FROM TELLURIDE

Site location context

Political divisions (FIPS codes)

San Miguel(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Dolores Peak(quadrangle 1:24,000 scale)

Dove Creek(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Miguel(hydrologic unit)

Upper Colorado-Dolores(hydrologic accounting unit)

Upper Colorado-Dolores(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

Grand Mesa, Uncompahgre and Gunnison National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado San Miguel

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 042N 010W 31 S2 Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). MINE LIES NEAR HEAD OF UNNAMED TRIBUTARY OF ELK CREEK 1.2 MILES WSW OF WILSON PEAK. CLAIMS STRADDLE DOLORES SAN MIGUEL COUNTY LINE. ; INFO FROM LAND.ST :41? 01 1975

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Lead Secondary
Copper Secondary
Zinc Critical Tertiary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Analytical data

Result 1936 ORE SHIPMENT FROM POLAR CLAIM CONTAINED 2.4 OZ/TON AU
Result THAT FROM 1938 CONTAINED 1.62 OZ/TON AU. BROMFIELD AND OTHERS (1972) SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSIS OF SELECTED DUMP SAMPLE CONTAINED 7% FE, 0.15% MG, 1% CA, 0.15% TI, 700 PPM MN, 30 PPM AG, 3000 PPM AS, 10 PPM B, 500 PPM BA, 30 PPM BI, LT 20 PPM CD, 10 PPM CO, LT 5 PPM CR, 3000 PPM CU, 10 PPM MO, LT 5 PPM NI, 2000 PPM PB, 700 PPM SB, LT 10 PPM SN, LT 100 PPM SR, 30 PPM V, 3000 PPM ZN
Result CHEMICAL ANALYSIS SHOWED 18 PPM AU, 63 PPM AG, 9200 PPM CU, 9600 PPM PB, 8000 PPM ZN.

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Wilson Peak Stock--Porphyrytic Adamellite;Wilson Peak Stock--Microgranogabbro
    Rock description Wilson Peak Stock--Porphyrytic Adamellite;Wilson Peak Stock--Microgranogabbro
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

Main Entrance (1) -108.01366, 37.868
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Paradox Basin, San Miguel Mtns
Type of structure Local
Structure description Wilson Peak Stock

Controls for ore emplacement

  • Ne-Trending Fissure Cutting Intrusive Rocks

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1940

Mining district

District name Mount Wilson District

Land status

Ownership category National Forest
Area name San Juan N. F. (?)

Ownership information

  • Type Operator
    Owner Fred Sellan
    Home office Grand Junction, Co.
    First year 1960
  • Type Owner
    Owner Campbell Brothers
    Home office Placerville, Co.
    First year 1960

Comments on the ownership information

  • Deleted record 10288989 notes in the bibliographic references section " OWN-OP: Fred Sellan, 1960"

Comments on the production information

  • PARTIAL PRODUCTION RECORD. FIGURES UNAVAILABLE FOR YEARS PRIOR TO 1937. AU FIGURE CALCULATED FROM REPORTED VALUE USING PRICE OF $35/OZ. OTHER FIGURES REPORTED AS VALUES BUT WITH UNKNOWN AVERAGE PRICES.

Comments on the workings information

  • TWO ADITS (CAVED) COMPRISING 1500 FT OF CROSSCUTS AND DRIFTS (BY 1900)

Comments on development

  • CLAIMS SURVEYED AND PATENTED IN 1899, BUT DEVELOPMENT WORK AND SOME STOPING AND SMALL PRODUCTION HAD TAKEN PLACE BEFORE 1896. LAST ACTIVITY WAS PROBABLY 8 ST HAND-COBBED ORE PRODUCED IN 1934-1940. CDM RECORDS SHOW SMALL PRODUCTION IN 1936 CREDITED TO POLAR (CLAIM).

Reference information

Bibliographic references

  • Production

    BROMFIELD AND OTHERS, 1972, P. 19 (AS COMPILED FROM USGS, USBM, AND US MINT RECORDS)

  • Deposit

    BROMFIELD, C.S., AND OTHERS, 1972, MINERAL RESOURCES OF THE WILSON MOUNTAINS PRIMITIVE AREA, COLORADO: USGS BULL. 1353-A, P.54-55, 66-67.

  • Deposit

    BUSH, A.L., AND BROMFIELD, C.S., 1966, GEOLOGIC MAP OF THE DOLORES PEAK QUADRANGLE, DOLORES AND SAN MIGUEL COUNTIES, COLORADO: USGS MAP GQ-536.

  • Deposit

    BLM MINERAL SURVEY MS 12908

  • Deposit

    COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.

  • Deposit

    CDM Summary Annual Report 1960, MMR DOC #407862.

General comments

Subject category Comment text
Deposit MINE DEVELOPED ON PROBABLE SW EXTENSION OF SILVER PICK VEIN, TRENDING ABOUT N 65 E, DIPPING STEEPLY NW, NEAR INTERSECTION WITH PROMINENT JOINT TRENDING N 78 W.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-83 Schwochow, Stephen D. Colorado Geological Survey
Reporter 17-NOV-83 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Editor 02-JUL-08 Wilson, Anna B. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.